QNameEnumLookup.java
/*
* Copyright 2018 Red Hat, Inc. and/or its affiliates
* and other contributors as indicated by the @author tags.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.keycloak.saml.processing.core.parsers.util;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.Objects;
import javax.xml.XMLConstants;
import javax.xml.namespace.QName;
/**
*
* @author hmlnarik
*/
public class QNameEnumLookup<E extends Enum<E> & HasQName> {
private final Map<QName, E> qNameConstants;
public QNameEnumLookup(E[] e) {
Map<QName, E> q = new HashMap<>(e.length);
E old;
for (E c : e) {
QName qName = c.getQName();
if ((old = q.put(qName, c)) != null) {
throw new IllegalStateException("Same name " + qName + " used for two distinct constants: " + c + ", " + old);
}
// Add the relaxed version without namespace
if (qName.getNamespaceURI() != null && ! Objects.equals(qName.getNamespaceURI(), XMLConstants.NULL_NS_URI)) {
qName = new QName(qName.getLocalPart());
if (q.containsKey(qName)) {
q.put(qName, null);
} else {
q.put(qName, c);
}
}
}
this.qNameConstants = Collections.unmodifiableMap(q);
}
/**
* Looks up the given {@code name} and returns the corresponding constant.
* @param name
* @return
*/
public E from(QName name) {
E c = qNameConstants.get(name);
if (c == null) {
name = new QName(name.getLocalPart());
c = qNameConstants.get(name);
}
return c;
}
}